Graphene, a single layer of graphite, is a remarkable recent addition to the family of two-dimensional electronic materials. Its linear dispersion relation and the chiral nature of its quasiparticles have created intense experimental and theoretical interest [1]}. Central to understanding the electronic transport properties of graphene is the mechanism causing the scattering of its charge carriers. While scanning probe studies show little evidence of intrinsic structural defects in the graphene lattice [2]}, [3]}, scattering may result from extrinsic sources, such as charged impurities on top of graphene or in the underlying substrate [4]}, [5]}, [6]}, corrugation of the graphene sheet [7]}, phonons in graphene [8]}, [9]}, [10]}, [11]} or remote interfacial phonons in the substrate [8]}. The formation of electron and hole puddles can further contribute to scattering at low carrier density [13]}, [14]}.
